[PATCH net-next 0/4] net: xilinx: axienet: Multicast fixes and improvements

Sean Anderson
2024-08-12T20:04:54Z

This series has a few small patches improving the handling of multicast
addresses. In particular, it makes the driver a whole lot less spammy,
and adjusts things so we aren't in promiscuous mode when we have more
than four multicast addresses (a common occurance on modern systems).

As the hardware has a 4-entry CAM, the ideal method would be to "pack"
multiple addresses into one CAM entry. Something like:

entry.address = address[0] | address[1];
entry.mask = ~(address[0] ^ address[1]);

Which would make the entry match both addresses (along with some others
that would need to be filtered in software).

Mapping addresses to entries in an efficient way is a bit tricky. If
anyone knows of an in-tree example of something like this, I'd be glad
to hear about it.

Sean Anderson (4):
net: xilinx: axienet: Always disable promiscuous mode
net: xilinx: axienet: Fix dangling multicast addresses
net: xilinx: axienet: Don't print if we go into promiscuous mode
net: xilinx: axienet: Support IFF_ALLMULTI

drivers/net/ethernet/xilinx/xilinx_axienet.h | 3 ++
.../net/ethernet/xilinx/xilinx_axienet_main.c | 52 +++++++++----------
2 files changed, 29 insertions(+), 26 deletions(-)

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2.35.1.1320.gc452695387.dirty